Practical Separation of Olefins (Alkenes) from LPG

Hydrogenise the alkenes to alkanes first?

Change supplier if your current supplier does not provide fuel within your specification?

Have you looked into hydrogenation?

Edit: PWSlack beat me to the punch

Thanks everyone. In Uruguay, a state company has the monopoly of petroleum products' supply, so I can't change suppliers.

Hydrogenation looks like the way to go. Unfortunately, at our company we don't have the infrastructure to set up a process like that. I'm going to take a look at local providers.

So, what is this LPG being used for, and why don't other users report a polymerisation problem? Does this particular installation have a monopoly on vaporising LPG? If not, then where is the user forum in which best practice can be shared and commercial pressure be brought to bear on the monopoly supplier?

The problem is that by law, the only supplier of LPG can be this state monopoly, ANCAP. They refine it from very low-quality venezuelan petroleum, that contains many olefins. There is no forum, we either take it or leave it.

Polymerisation occurs via a free radical initiated process. I would suggest adding a "free radical scavenger" or "chain terminator" to your LPG. Such chemicals as thiols (mercaptans), though rather smelly, are used to inhibit polymer formation and to limit their molecular weight. I don't have the time to research this for you at the moment, since I am in bed and my wife wants to turn the light out! Good luck.

LPG already contains mercaptans, so users may spot leaks. I'll find out its concentration and maybe more could be added.

Thank you